2L Gen3 Smart Relay
The Shelly 2L Gen3 runs two no-neutral lighting circuits from one module, made for light switches that have no neutral in the switch box.
$64.95 inc GST In stock · ships today
Channels
Filter guide
What's a channel?
A channel is one output the device controls on its own. On a relay, each channel switches one circuit, so a 2-channel relay runs two lights separately. On an LED strip controller, each channel drives one colour line of the strip.
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One channel
Switches one circuitSwitches one thing on its own: a light, a fan, an exhaust.
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Two channels
Switches two circuitsTwo circuits controlled separately, like both halves of a double switch.
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Everything you need to know
The Shelly 2L Gen3 is a two-channel Wi-Fi relay that controls two lights from a switch box with no neutral wire. It runs on 220–240 V and has no power metering. It needs a licensed electrician to install.
Product features
Two lights, no neutral wire
Most Shelly relays need a neutral wire in the switch box. The 2L Gen3 doesn't: it runs on the live wire alone and controls two separate lights, which suits a double light switch in a box without a neutral.
- Live wire only, no neutral needed
- Two independent lighting channels
- Runs on 220–240 V
Bypass required for LED lights on channel 1
View the Shelly BypassWhen the light on the first channel is LED, Shelly requires a Bypass 1L/2L Gen3 installed next to that light. The second channel doesn't need one, and incandescent lights run without a Bypass.
- Bypass required on channel 1 for LED lights
- Up to 200 W on channel 1
- Up to 700 W on channel 2
Both switches keep working
The 2L Gen3 has two switch inputs, so both switches on a double light switch stay connected and keep doing their job. Each light gains app control, voice control with Alexa or Google Home, and its own schedules.
- Two switch inputs
- Fits behind a double light switch
- Alexa, Google Home and Home Assistant
Schedules for each light, run on the relay
Schedules and scripts live on the Shelly 2L Gen3, so each light can follow its own timetable even when the internet is down. Everything is adjustable from the built-in web interface.
- Up to 20 schedules
- Scripting support
- Overheating protection built in
What is a Shelly relay?
A relay is a small module that hides in the wall box behind a switch, or on the rail in your switchboard, wired in between the power and whatever it controls. That might be a light, an exhaust fan, a towel rail, a pump, or the motor that opens your garage door. Nothing on show has to change. The switch stays on the wall and keeps working exactly as it does now, and the same circuit can also be turned on from your phone, on a schedule, or by an automation.
The number
One channel per circuit
The number in the name is how many things the module can switch on its own, from one up to four. A single light or exhaust fan takes a 1. A double light switch controlling two separate lights takes a 2, and each side still works on its own. The Pro 4PM goes up to four.
Pro and Mini
Where the module lives
Everything else in the name is about size and place. The standard module sits in the wall box behind your switch, and the Mini is a smaller version of it for when there is very little room left in the box. Pro units are built for the switchboard, clipping onto DIN rail, which is where whole circuits and three-phase work belong.
PM
What PM on the end means
PM is power measurement. Those models report what the circuit is drawing and the energy it has used over time, alongside the on or off state, so you can see what a heater or a pool pump actually costs to run. Models without PM switch the circuit and tell you nothing about it.
Gen 3 and Gen 4
What the generation changes
The generation tells you which protocols the module speaks. Gen 3 is Wi-Fi and Bluetooth. Gen 4 adds Zigbee and has Matter built in, though it runs one or the other, not both at once. The wiring, the app and the local control are identical. Pro units carry no generation in their name.
The existing controls
Nothing you already use stops working
The switch on the wall keeps doing what it has always done, and so does the button inside the garage. Whatever controls that circuit now carries on working, and the relay adds a second way in from an app, a schedule or a voice assistant. Nobody in the house has to change how they do things.
Smart bulbs
Smart lights that stay reachable
Smart bulbs only work while they have power, so one flick of the wall switch makes them unreachable via an app, like Philips Hue. Set the relay to Detached and the bulbs stay powered while the switch becomes a button your smart home can read, which is how a system like Home Assistant gets the switch and the bulbs working together again.
Works with
Also works with
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Pairs with Amazon Alexa
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Pairs with Google Home
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Pairs with Home Assistant
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Pairs with SmartThings
Connects over
On your Wi-Fi
Joins your home network, so you control it from the app with no hub or bridge.
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Wi-Fi
Set up over Bluetooth
Used once, to get it onto your Wi-Fi.
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Bluetooth
Works offline
Keeps working on your home network when the internet is down.
Scripts
11
Give it jobs the app can't
Scripts add jobs the relay can't do with the Shelly app's schedules and actions alone, like acting on the weather forecast or sending an alert to your phone. Each one is a small program that runs on the relay itself: copy it, paste it into the device's script editor and press Start. It doesn't need a hub, a cloud account or a subscription.
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Heating & hot water Cap how many hours a heater or pump runs each day -
Lighting Control a Philips Hue room from a wall switch -
Garden Garden watering that skips the run when it rains -
Safety Holiday lights that come on at a different time each night -
Heating & hot water Hot water or pool pump on off-peak times, with a boost switch -
Network Internet watchdog that restarts your modem
Scripts are free; installing one takes about two minutes.
Which relay do I need?
Gen3 is the value pick for everyday Wi-Fi setups. Gen4 adds an upgraded processor, Wi-Fi 6 and Zigbee. Matter is on out of the box, so it pairs with Apple Home, Google Home or Alexa directly, without the need for the Shelly app. Pro is built to go inside your switchboard, clipping onto the same DIN rail as your circuit breakers, and connects over Ethernet as well as Wi-Fi.
If you want a reliable relay behind a switch at the lowest price, and you run the Shelly app or Home Assistant over Wi-Fi, Gen3 does the job. For a new setup, Gen4 is the one we'd pick. If you already run a Zigbee network, Gen4 slots straight into it, and because every Gen4 relay is also a Zigbee repeater, each one you add extends and strengthens that network. A relay on Zigbee gives up Matter and its own settings page, so you choose which each one runs. And if you're searching for Gen2, it shipped under different names, the Plus and Pro ranges.
| Feature | Gen3 This model | Gen4 | Pro |
|---|---|---|---|
| Best for | Everyday Wi-Fi setups on a budget | New setups and Matter or Zigbee homes | Switchboards and bigger jobs |
| Connects over | Wi-Fi Bluetooth | Wi-Fi 6 Bluetooth Zigbee | Wi-Fi Bluetooth Ethernet |
| Matter | On some models, turned on in settings | Built in and on by default | Not supported |
| Mounting | Behind the switch or power point | Behind the switch or power point | DIN rail in the switchboard |
| Price from | $55.95 | $34.95 | $89.95 |
| Model | Channels | Price |
|---|---|---|
| 1L | 1 channel | $55.95 |
| Viewing: 2L | 2 channels | $64.95 |
Behind the switch
Fits in the wall cavity behind an existing switch or power point. The switch on the wall stays and still works; the relay sits behind it and makes the circuit smart.
In the switchboard
Clips onto the standard rail in your switchboard, next to the circuit breakers. Keeps everything in one serviceable spot, which suits whole-home installs and bigger jobs.
What's a channel?
A channel is one output the device controls on its own. On a relay, each channel switches one circuit, so a 2-channel relay runs two lights separately. On an LED strip controller, each channel drives one colour line of the strip.
Specifications & Installation
Setup · 2:16
How to install it
Shelly's install walkthrough for the 2L Gen3, including fitting the Bypass.
Watch setup videoNo specifications match.
Build
- Type
- Module
- Module size
- Standard
- Channels
- 2 channels Also available: One channel
- Form
- In-wall
- Housing material
- Plastic
- Power
- Hardwired
- Supply voltage
- 220–240 V
- Standby power
- < 1.2 W
- Generation
- Gen3
- Neutral required
- No
- Shelly Bypass included
- Yes
- Neutral not needed
- Yes (Shelly Bypass is required for the load at O1)
- Min. load without neutral and without a Bypass
- No (Shelly Bypass for 1L/2L is required for the load at O1), for all LED lights. No, Bypass is not needed for incandescent lights.
- Dry-contact mode
- No
- Energy monitoring
- No
- Drives blinds & shutters
- No
- Local control
- Yes
- Standard
- 802.11 b/g/n
- Range (indoors)
- 30 metres
- Version
- 4.2
- Range (indoors)
- 10 metres
- RF band
- 2400 - 2483.5 MHz
- Max. RF power
- < 4 dBm
- Operating temperature
- -20–40 °C
- Operating humidity
- 30–70 % RH
- Max altitude
- 2000 metres
- Size (HxWxD)
- 37x42x16 ±0.5 mm / 1.46x1.65x0.63 ±0.02 in
- Weight
- 28 g / 1 oz
- Screw terminals max torque
- 0.4 Nm / 3.5 lbin
- Conductor cross section
- 0.5 to 4 mm² / 20 to 11 AWG (solid, stranded, and bootlace ferrules)
- Conductor stripped length
- 6 to 7 mm / 0.24 to 0.24 in
- Mounting
- In-wall
- Shell color
- Cyan
- Terminal color
- Black
- Storage temperature
- 10°C to 40 °C
- Max. switching voltage
- 240 V~
- Max. switching power
- * 200 W through O1 * 700 W through O2
- Internal-temperature sensor
- Yes
- Protocol
- 802.11 b/g/n
- RF band
- 2401 - 2495 МHz
- Max. RF power
- < 20 dBm
- Range
- Up to 30 m / 100 ft indoors and 50 m / 160 ft outdoors (Depends on local conditions)
- CPU
- ESP-Shelly-C38F
- Clock frequency
- 160 Mhz
- RAM
- 512 KB
- Flash
- 8 MB
- Schedules
- 20
- Webhooks (URL actions)
- 20 with 5 URLs per hook
- Scripting
- Yes
- MQTT
- Yes
- SKU
- SHE-RLY-0011
- MPN
- S3SW-0A2X4EUL
- Barcode
- 3800235261644
What you can do with it
A warm towel rail on winter mornings
Schedule the rail for weekday mornings and it's warm when you step out of the shower, off again before you leave. No more discovering it's been heating an empty house all day. Control with any of
Bathroom fan that clears the steam, then turns itself off
The exhaust fan keeps running after the light goes off, long enough to clear the steam, then shuts itself down. Add a humidity sensor and it only runs when the room needs it. Control with any of 
Outdoor lights on at sunset, off at midnight
Porch, path and garden lights follow the sun through the year without you touching a switch. Run the lights you have from a Shelly relay, or fit Philips Hue outdoor lights, and set it up in their app or Home Assistant. Control with any of 
Common questions
Quick answers before you buy. We test this gear ourselves. Can't find yours? Ask our Melbourne team
Yes, though it's a small job. Shelly relays wire into 240V mains circuits, so in Australia a licensed electrician fits them, and a single relay doesn't take a sparky long.
No. The L series powers itself through the load, so it suits the many Australian light switches that have no neutral in the switch box. With very low-wattage LED lighting, add the Shelly Bypass to keep it stable.
No. It connects to your Wi-Fi and works from the Shelly app with no hub and no subscription. Schedules and automations run on the device itself, so they keep working if the internet drops out.
Shelly · 2L Gen3 Smart Relay